Ahad Rana created HDFS-4081:
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Summary: NamenodeProtocol and other Secure Protocols should use different config keys for serverPrincipal and clientPrincipal KerberosInfo components
Key: HDFS-4081
URL: https://issues.apache.org/jira/browse/HDFS-4081
Project: Hadoop HDFS
Issue Type: Bug
Components: security
Affects Versions: 2.0.2-alpha, 2.0.1-alpha, 2.0.0-alpha, 2.0.3-alpha
Reporter: Ahad Rana
The Namenode protocol (NamenodeProtocol.java) defines the same config key, dfs.namenode.kerberos.principal, for both ServerPrincipal and ClientPrincipal components of the KerberosInfo data structure. This overloads the meaning of the dfs.namenode.kerberos.principal config key. This key can be used to define the namenode's principal during startup, but in the client case, it is used by ServiceAuthorizationManager.authorize to create a principal name given an incoming client's ip address. If you explicitly set the principal name for the namenode in the Config using this key, it then breaks ServiceAuthorizationManager.authorize, because it expects this same value to contain a Kerberos principal name pattern NOT an explicit name.
The solve this issue, the ServerPrincipal and ClientPrincipal components of the NamenodeProtocol should each be assigned unique Config keys.
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